The city was the capital of Egypt during part of the Eleventh Dynasty (Middle Kingdom), and most of the Eighteenth Dynasty (New Kingdom), though the administration probably remained located at Memphis for much of this. With the Nineteenth Dynasty the seat of government moved to the Delta.
Thebes was the seat of the Theban triad of Amun, Mut, and Khonsu, and it was known from the end of the New Kingdom as niwt-imn, "The City of Amun".
The archaeological remains of Thebes offer a striking testimony to Egyptian civilization at its height. In modern usage, the mortuary temples and tombs on the west bank of the river Nile are generally thought of as being part of Thebes.
Adapted from Wikipedia
Thebes in Digital Egypt
Thebes in Global Egyptian Museum